![]() The logical next step was to see how well high refresh rate gaming works. Vivo V21 5G: 90Hz mode in Facebook, Instagram and TikTok apps Here are some other examples of this behavior within Facebook, Instagram and TikTok. Vivo V21 5G: 90Hz mode playing back full-screen video We found this to work nearly always with a full-screen video playing and more often than not with a video as just part of the rest of the UI. Extra points there! Once the OS detects that there is a video playing back on screen, it drops the refresh rate to 60Hz, regardless of whether you are interacting with the phone or not. One important thing to note is that vivo appears to have some video playback detection in place, which we love to see. Vivo V21 5G: 90Hz mode in Gallery and YouTube This behavior is also applied to most apps, including first-party and third-party ones. This is great for most use cases, which we appreciate. Once you leave whatever is on screen for a few seconds, it drops down to 60Hz. Generally speaking, in 90Hz mode, the V21 tries to operate at 90Hz when interacting with the display. One would naturally assume, then, that the 90Hz mode is also fixed. The UI and every app - it all runs at 60Hz. ![]() There are idiosyncrasies involved, so let's just get the simplest 60Hz mode out of the way first. The vivo V21 5G has a total of three refresh rate settings - 60Hz, 90Hz and Smart Switch. Hence, the more important bar the vivo V21 5G has to clear is being able to deliver 90Hz when needed for the sake of experience. We can share from experience that running a modern OLED panel at 90Hz typically puts little extra strain on the battery than the vanilla 60Hz. The OS needs to be smart enough to handle this extra refresh rate properly, so you can make use of it when it matters, like scrolling or playing a compatible game and then not have it waste unnecessary battery in other scenarios like watching videos. Having the extra refresh rate, however, is just one part of the equation. Especially while scrolling a vertical UI. Even so, the jump in smoothness from 60Hz is very noticeable. That's what we would consider "entry-level" high refresh rate nowadays, for lack of a better term. This is not that odd, though, since Netflix has its own whitelists to allow the feature, so support could be on the way. At the time of writing this review, the Netflix app itself confirms Widevine and offers up FullHD streams but no HDR. There is also Widevine L1 certification, which means you get to enjoy high resolution, enough to saturate the FullHD+ display of the phone with services such as Netflix. And, indeed, software reports the same - HDR10+, as well as HLG support. We did check whether the display actually got any brighter in the process, but that wasn't the case. This results in the sort of "punchiness" that OLED panels tend to be associated with. Then there is Bright, which boosts colors beyond the Standard mode. It's definitely good enough for regular use. It's better than the Standard mode, but the V21's display can't be considered perfectly color accurate. Professional mode appears to be targeting sRGB. It does so fairly well but there is more to be desired. The first one is the default and seems to be targeting the DCI-P3 color space. In terms of colors, the vivo V21 5G has a total of three color modes: Standard, Professional and Bright. This makes the particular OLED panel perfectly usable outdoors. The V21 can shone brighter sill in max auto mode, in bright lighting conditions. That sounds about right, since in our standardized test, we measured a respectable 467 nits, with the brightness slider mixed out. In terms of brightness, vivo markets a respectable 500 nits of typical output. As icing on the cake, there is also HDR10+ support thrown in the mix. A pretty smooth one, at that, with a 90Hz refresh rate. It is equipped with a 6.44-inch, AMOLED display. Mid-ranger or not, the vivo V21 does not skimp in the display department.
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